The number of safety cones along the road was 50% of the number of trees planted along it. After 77 safety cones and 77 trees were added to the stretch of road, the number of trees became 30% more than the number of safety cones. How many trees were there at first?
|
Safety Cones |
Trees |
Difference |
Before |
1x3 = 3 u |
2x3 = 6 u |
1x3 = 3 u |
Change |
+ 77 |
+ 77 |
|
After |
10x1 = 10 u |
13x1 = 13 u |
3x1 = 3 u |
50% =
50100 =
12Number of safety cones in the end in percentage = 100%
Number of trees in the end in percentage
= 100% + 30%
= 130%
130% =
130100 =
1310 Since the number of safety cones and trees added is the same, the difference in the number of safety cones and trees remains unchanged. LCM of 1 and 3 is 3.
Number of safety cones added
= 10 u - 3 u
= 7 u
7 u = 77
1 u = 77 ÷ 7 = 11
Number of trees at first
= 6 u
= 6 x 11
= 66
Answer(s): 66